Special topics

Cloud detection

discussion of detection of clouds, especially low and very low clouds

Which errors occur due to water vapor absorption at 905-920 nm wavelengths and how can these effects be corrected?

What is the reason for signal distortions (CL31 and CL51) in the free troposphere and how can this effect be corrected?

here you can find discussion about calibration issues (Rayleigh and cloud calibration )

Discussion of overlap effects and overlap measurements

What are differences between different PBL retrievals? Under which conditions can PBL retrieved (or not)?

Any other topic can be added here if needed and if somebody wants to provide content and takes the lead in the corresponding discussion

During rain the ceilometer signals vary significantly

from time to time dark current measurements are performed; overview of results are shown here

Examples of detector saturation